Image sensor capable of producing an image signal free from an a

Details Image sensor capable of producing an image signal free from an a Image sensor capable of producing an image signal free from an a

1996-03-28

1998-06-30

Faile, Andrew

Television

Camera, system and detail

Combined image signal generator and general image signal...

348294, H04N 5335

Patent

active

057741808

ABSTRACT:
Charges photoelectrically generated in reversely biased photodiodes are sequentially transferred through respective thin-film transistors to a driver IC. A plurality of capacitors are connected to the anodes of the respective photodiodes. During a charge reading period, a variable voltage generation circuit supplies the cathode of each photodiode with a first voltage that is higher than an anode voltage to reversely bias the photodiode. During a predetermined period after the charge reading period, the variable voltage generation circuit supplies the cathode of the photodiode with a second voltage that is lower than the first voltage and a gate pulse generation circuit supplies, through the associated capacitor, the anode of the photodiode with a third voltage that allows the photodiode to be forwardly biased.

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patent: 5202575 (1993-04-01), Sakai
patent: 5331145 (1994-07-01), Weckler et al.

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